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[tomato.git] / release / src / router / busybox / networking / ftpd.c
blob1c97df564f5601ffa9251f87eca47757eea3d5d9
1 /* vi: set sw=4 ts=4: */
2 /*
3 * Simple FTP daemon, based on vsftpd 2.0.7 (written by Chris Evans)
4 *
5 * Author: Adam Tkac <vonsch@gmail.com>
6 *
7 * Licensed under GPLv2, see file LICENSE in this source tree.
8 *
9 * Only subset of FTP protocol is implemented but vast majority of clients
10 * should not have any problem.
11 *
12 * You have to run this daemon via inetd.
13 */
14
15 //usage:#define ftpd_trivial_usage
16 //usage: "[-wvS] [-t N] [-T N] [DIR]"
17 //usage:#define ftpd_full_usage "\n\n"
18 //usage: "Anonymous FTP server\n"
19 //usage: "\n"
20 //usage: "ftpd should be used as an inetd service.\n"
21 //usage: "ftpd's line for inetd.conf:\n"
22 //usage: " 21 stream tcp nowait root ftpd ftpd /files/to/serve\n"
23 //usage: "It also can be ran from tcpsvd:\n"
24 //usage: " tcpsvd -vE 0.0.0.0 21 ftpd /files/to/serve\n"
25 //usage: "\n -w Allow upload"
26 //usage: "\n -v Log errors to stderr. -vv: verbose log"
27 //usage: "\n -S Log errors to syslog. -SS: verbose log"
28 //usage: "\n -t,-T Idle and absolute timeouts"
29 //usage: "\n DIR Change root to this directory"
30
31 #include "libbb.h"
32 #include <syslog.h>
33 #include <netinet/tcp.h>
34
35 #define FTP_DATACONN 150
36 #define FTP_NOOPOK 200
37 #define FTP_TYPEOK 200
38 #define FTP_PORTOK 200
39 #define FTP_STRUOK 200
40 #define FTP_MODEOK 200
41 #define FTP_ALLOOK 202
42 #define FTP_STATOK 211
43 #define FTP_STATFILE_OK 213
44 #define FTP_HELP 214
45 #define FTP_SYSTOK 215
46 #define FTP_GREET 220
47 #define FTP_GOODBYE 221
48 #define FTP_TRANSFEROK 226
49 #define FTP_PASVOK 227
50 /*#define FTP_EPRTOK 228*/
51 #define FTP_EPSVOK 229
52 #define FTP_LOGINOK 230
53 #define FTP_CWDOK 250
54 #define FTP_RMDIROK 250
55 #define FTP_DELEOK 250
56 #define FTP_RENAMEOK 250
57 #define FTP_PWDOK 257
58 #define FTP_MKDIROK 257
59 #define FTP_GIVEPWORD 331
60 #define FTP_RESTOK 350
61 #define FTP_RNFROK 350
62 #define FTP_TIMEOUT 421
63 #define FTP_BADSENDCONN 425
64 #define FTP_BADSENDNET 426
65 #define FTP_BADSENDFILE 451
66 #define FTP_BADCMD 500
67 #define FTP_COMMANDNOTIMPL 502
68 #define FTP_NEEDUSER 503
69 #define FTP_NEEDRNFR 503
70 #define FTP_BADSTRU 504
71 #define FTP_BADMODE 504
72 #define FTP_LOGINERR 530
73 #define FTP_FILEFAIL 550
74 #define FTP_NOPERM 550
75 #define FTP_UPLOADFAIL 553
76
77 #define STR1(s) #s
78 #define STR(s) STR1(s)
79
80 /* Convert a constant to 3-digit string, packed into uint32_t */
81 enum {
82 /* Shift for Nth decimal digit */
83 SHIFT2 = 0 * BB_LITTLE_ENDIAN + 24 * BB_BIG_ENDIAN,
84 SHIFT1 = 8 * BB_LITTLE_ENDIAN + 16 * BB_BIG_ENDIAN,
85 SHIFT0 = 16 * BB_LITTLE_ENDIAN + 8 * BB_BIG_ENDIAN,
86 /* And for 4th position (space) */
87 SHIFTsp = 24 * BB_LITTLE_ENDIAN + 0 * BB_BIG_ENDIAN,
88 };
89 #define STRNUM32(s) (uint32_t)(0 \
90 | (('0' + ((s) / 1 % 10)) << SHIFT0) \
91 | (('0' + ((s) / 10 % 10)) << SHIFT1) \
92 | (('0' + ((s) / 100 % 10)) << SHIFT2) \
93 )
94 #define STRNUM32sp(s) (uint32_t)(0 \
95 | (' ' << SHIFTsp) \
96 | (('0' + ((s) / 1 % 10)) << SHIFT0) \
97 | (('0' + ((s) / 10 % 10)) << SHIFT1) \
98 | (('0' + ((s) / 100 % 10)) << SHIFT2) \
99 )
100
101 #define MSG_OK "Operation successful\r\n"
102 #define MSG_ERR "Error\r\n"
103
104 struct globals {
105 int pasv_listen_fd;
106 #if !BB_MMU
107 int root_fd;
108 #endif
109 int local_file_fd;
110 unsigned end_time;
111 unsigned timeout;
112 unsigned verbose;
113 off_t local_file_pos;
114 off_t restart_pos;
115 len_and_sockaddr *local_addr;
116 len_and_sockaddr *port_addr;
117 char *ftp_cmd;
118 char *ftp_arg;
119 #if ENABLE_FEATURE_FTP_WRITE
120 char *rnfr_filename;
121 #endif
122 /* We need these aligned to uint32_t */
123 char msg_ok [(sizeof("NNN " MSG_OK ) + 3) & 0xfffc];
124 char msg_err[(sizeof("NNN " MSG_ERR) + 3) & 0xfffc];
125 } FIX_ALIASING;
126 #define G (*(struct globals*)&bb_common_bufsiz1)
127 #define INIT_G() do { \
128 /* Moved to main */ \
129 /*strcpy(G.msg_ok + 4, MSG_OK );*/ \
130 /*strcpy(G.msg_err + 4, MSG_ERR);*/ \
131 } while (0)
132
133
134 static char *
135 escape_text(const char *prepend, const char *str, unsigned escapee)
136 {
137 unsigned retlen, remainlen, chunklen;
138 char *ret, *found;
139 char append;
140
141 append = (char)escapee;
142 escapee >>= 8;
143
144 remainlen = strlen(str);
145 retlen = strlen(prepend);
146 ret = xmalloc(retlen + remainlen * 2 + 1 + 1);
147 strcpy(ret, prepend);
148
149 for (;;) {
150 found = strchrnul(str, escapee);
151 chunklen = found - str + 1;
152
153 /* Copy chunk up to and including escapee (or NUL) to ret */
154 memcpy(ret + retlen, str, chunklen);
155 retlen += chunklen;
156
157 if (*found == '\0') {
158 /* It wasn't escapee, it was NUL! */
159 ret[retlen - 1] = append; /* replace NUL */
160 ret[retlen] = '\0'; /* add NUL */
161 break;
162 }
163 ret[retlen++] = escapee; /* duplicate escapee */
164 str = found + 1;
165 }
166 return ret;
167 }
168
169 /* Returns strlen as a bonus */
170 static unsigned
171 replace_char(char *str, char from, char to)
172 {
173 char *p = str;
174 while (*p) {
175 if (*p == from)
176 *p = to;
177 p++;
178 }
179 return p - str;
180 }
181
182 static void
183 verbose_log(const char *str)
184 {
185 bb_error_msg("%.*s", (int)strcspn(str, "\r\n"), str);
186 }
187
188 /* NB: status_str is char[4] packed into uint32_t */
189 static void
190 cmdio_write(uint32_t status_str, const char *str)
191 {
192 char *response;
193 int len;
194
195 /* FTP uses telnet protocol for command link.
196 * In telnet, 0xff is an escape char, and needs to be escaped: */
197 response = escape_text((char *) &status_str, str, (0xff << 8) + '\r');
198
199 /* FTP sends embedded LFs as NULs */
200 len = replace_char(response, '\n', '\0');
201
202 response[len++] = '\n'; /* tack on trailing '\n' */
203 xwrite(STDOUT_FILENO, response, len);
204 if (G.verbose > 1)
205 verbose_log(response);
206 free(response);
207 }
208
209 static void
210 cmdio_write_ok(unsigned status)
211 {
212 *(uint32_t *) G.msg_ok = status;
213 xwrite(STDOUT_FILENO, G.msg_ok, sizeof("NNN " MSG_OK) - 1);
214 if (G.verbose > 1)
215 verbose_log(G.msg_ok);
216 }
217 #define WRITE_OK(a) cmdio_write_ok(STRNUM32sp(a))
218
219 /* TODO: output strerr(errno) if errno != 0? */
220 static void
221 cmdio_write_error(unsigned status)
222 {
223 *(uint32_t *) G.msg_err = status;
224 xwrite(STDOUT_FILENO, G.msg_err, sizeof("NNN " MSG_ERR) - 1);
225 if (G.verbose > 0)
226 verbose_log(G.msg_err);
227 }
228 #define WRITE_ERR(a) cmdio_write_error(STRNUM32sp(a))
229
230 static void
231 cmdio_write_raw(const char *p_text)
232 {
233 xwrite_str(STDOUT_FILENO, p_text);
234 if (G.verbose > 1)
235 verbose_log(p_text);
236 }
237
238 static void
239 timeout_handler(int sig UNUSED_PARAM)
240 {
241 off_t pos;
242 int sv_errno = errno;
243
244 if ((int)(monotonic_sec() - G.end_time) >= 0)
245 goto timed_out;
246
247 if (!G.local_file_fd)
248 goto timed_out;
249
250 pos = xlseek(G.local_file_fd, 0, SEEK_CUR);
251 if (pos == G.local_file_pos)
252 goto timed_out;
253 G.local_file_pos = pos;
254
255 alarm(G.timeout);
256 errno = sv_errno;
257 return;
258
259 timed_out:
260 cmdio_write_raw(STR(FTP_TIMEOUT)" Timeout\r\n");
261 /* TODO: do we need to abort (as opposed to usual shutdown) data transfer? */
262 exit(1);
263 }
264
265 /* Simple commands */
266
267 static void
268 handle_pwd(void)
269 {
270 char *cwd, *response;
271
272 cwd = xrealloc_getcwd_or_warn(NULL);
273 if (cwd == NULL)
274 cwd = xstrdup("");
275
276 /* We have to promote each " to "" */
277 response = escape_text(" \"", cwd, ('"' << 8) + '"');
278 free(cwd);
279 cmdio_write(STRNUM32(FTP_PWDOK), response);
280 free(response);
281 }
282
283 static void
284 handle_cwd(void)
285 {
286 if (!G.ftp_arg || chdir(G.ftp_arg) != 0) {
287 WRITE_ERR(FTP_FILEFAIL);
288 return;
289 }
290 WRITE_OK(FTP_CWDOK);
291 }
292
293 static void
294 handle_cdup(void)
295 {
296 G.ftp_arg = (char*)"..";
297 handle_cwd();
298 }
299
300 static void
301 handle_stat(void)
302 {
303 cmdio_write_raw(STR(FTP_STATOK)"-Server status:\r\n"
304 " TYPE: BINARY\r\n"
305 STR(FTP_STATOK)" Ok\r\n");
306 }
307
308 /* Examples of HELP and FEAT:
309 # nc -vvv ftp.kernel.org 21
310 ftp.kernel.org (130.239.17.4:21) open
311 220 Welcome to ftp.kernel.org.
312 FEAT
313 211-Features:
314 EPRT
315 EPSV
316 MDTM
317 PASV
318 REST STREAM
319 SIZE
320 TVFS
321 UTF8
322 211 End
323 HELP
324 214-The following commands are recognized.
325 ABOR ACCT ALLO APPE CDUP CWD DELE EPRT EPSV FEAT HELP LIST MDTM MKD
326 MODE NLST NOOP OPTS PASS PASV PORT PWD QUIT REIN REST RETR RMD RNFR
327 RNTO SITE SIZE SMNT STAT STOR STOU STRU SYST TYPE USER XCUP XCWD XMKD
328 XPWD XRMD
329 214 Help OK.
330 */
331 static void
332 handle_feat(unsigned status)
333 {
334 cmdio_write(status, "-Features:");
335 cmdio_write_raw(" EPSV\r\n"
336 " PASV\r\n"
337 " REST STREAM\r\n"
338 " MDTM\r\n"
339 " SIZE\r\n");
340 cmdio_write(status, " Ok");
341 }
342
343 /* Download commands */
344
345 static inline int
346 port_active(void)
347 {
348 return (G.port_addr != NULL);
349 }
350
351 static inline int
352 pasv_active(void)
353 {
354 return (G.pasv_listen_fd > STDOUT_FILENO);
355 }
356
357 static void
358 port_pasv_cleanup(void)
359 {
360 free(G.port_addr);
361 G.port_addr = NULL;
362 if (G.pasv_listen_fd > STDOUT_FILENO)
363 close(G.pasv_listen_fd);
364 G.pasv_listen_fd = -1;
365 }
366
367 /* On error, emits error code to the peer */
368 static int
369 ftpdataio_get_pasv_fd(void)
370 {
371 int remote_fd;
372
373 remote_fd = accept(G.pasv_listen_fd, NULL, 0);
374
375 if (remote_fd < 0) {
376 WRITE_ERR(FTP_BADSENDCONN);
377 return remote_fd;
378 }
379
380 setsockopt(remote_fd, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
381 return remote_fd;
382 }
383
384 /* Clears port/pasv data.
385 * This means we dont waste resources, for example, keeping
386 * PASV listening socket open when it is no longer needed.
387 * On error, emits error code to the peer (or exits).
388 * On success, emits p_status_msg to the peer.
389 */
390 static int
391 get_remote_transfer_fd(const char *p_status_msg)
392 {
393 int remote_fd;
394
395 if (pasv_active())
396 /* On error, emits error code to the peer */
397 remote_fd = ftpdataio_get_pasv_fd();
398 else
399 /* Exits on error */
400 remote_fd = xconnect_stream(G.port_addr);
401
402 port_pasv_cleanup();
403
404 if (remote_fd < 0)
405 return remote_fd;
406
407 cmdio_write(STRNUM32(FTP_DATACONN), p_status_msg);
408 return remote_fd;
409 }
410
411 /* If there were neither PASV nor PORT, emits error code to the peer */
412 static int
413 port_or_pasv_was_seen(void)
414 {
415 if (!pasv_active() && !port_active()) {
416 cmdio_write_raw(STR(FTP_BADSENDCONN)" Use PORT/PASV first\r\n");
417 return 0;
418 }
419
420 return 1;
421 }
422
423 /* Exits on error */
424 static unsigned
425 bind_for_passive_mode(void)
426 {
427 int fd;
428 unsigned port;
429
430 port_pasv_cleanup();
431
432 G.pasv_listen_fd = fd = xsocket(G.local_addr->u.sa.sa_family, SOCK_STREAM, 0);
433 setsockopt_reuseaddr(fd);
434
435 set_nport(&G.local_addr->u.sa, 0);
436 xbind(fd, &G.local_addr->u.sa, G.local_addr->len);
437 xlisten(fd, 1);
438 getsockname(fd, &G.local_addr->u.sa, &G.local_addr->len);
439
440 port = get_nport(&G.local_addr->u.sa);
441 port = ntohs(port);
442 return port;
443 }
444
445 /* Exits on error */
446 static void
447 handle_pasv(void)
448 {
449 unsigned port;
450 char *addr, *response;
451
452 port = bind_for_passive_mode();
453
454 if (G.local_addr->u.sa.sa_family == AF_INET)
455 addr = xmalloc_sockaddr2dotted_noport(&G.local_addr->u.sa);
456 else /* seen this in the wild done by other ftp servers: */
457 addr = xstrdup("0.0.0.0");
458 replace_char(addr, '.', ',');
459
460 response = xasprintf(STR(FTP_PASVOK)" PASV ok (%s,%u,%u)\r\n",
461 addr, (int)(port >> 8), (int)(port & 255));
462 free(addr);
463 cmdio_write_raw(response);
464 free(response);
465 }
466
467 /* Exits on error */
468 static void
469 handle_epsv(void)
470 {
471 unsigned port;
472 char *response;
473
474 port = bind_for_passive_mode();
475 response = xasprintf(STR(FTP_EPSVOK)" EPSV ok (|||%u|)\r\n", port);
476 cmdio_write_raw(response);
477 free(response);
478 }
479
480 static void
481 handle_port(void)
482 {
483 unsigned port, port_hi;
484 char *raw, *comma;
485 #ifdef WHY_BOTHER_WE_CAN_ASSUME_IP_MATCHES
486 socklen_t peer_ipv4_len;
487 struct sockaddr_in peer_ipv4;
488 struct in_addr port_ipv4_sin_addr;
489 #endif
490
491 port_pasv_cleanup();
492
493 raw = G.ftp_arg;
494
495 /* PORT command format makes sense only over IPv4 */
496 if (!raw
497 #ifdef WHY_BOTHER_WE_CAN_ASSUME_IP_MATCHES
498 || G.local_addr->u.sa.sa_family != AF_INET
499 #endif
500 ) {
501 bail:
502 WRITE_ERR(FTP_BADCMD);
503 return;
504 }
505
506 comma = strrchr(raw, ',');
507 if (comma == NULL)
508 goto bail;
509 *comma = '\0';
510 port = bb_strtou(&comma[1], NULL, 10);
511 if (errno || port > 0xff)
512 goto bail;
513
514 comma = strrchr(raw, ',');
515 if (comma == NULL)
516 goto bail;
517 *comma = '\0';
518 port_hi = bb_strtou(&comma[1], NULL, 10);
519 if (errno || port_hi > 0xff)
520 goto bail;
521 port |= port_hi << 8;
522
523 #ifdef WHY_BOTHER_WE_CAN_ASSUME_IP_MATCHES
524 replace_char(raw, ',', '.');
525
526 /* We are verifying that PORT's IP matches getpeername().
527 * Otherwise peer can make us open data connections
528 * to other hosts (security problem!)
529 * This code would be too simplistic:
530 * lsa = xdotted2sockaddr(raw, port);
531 * if (lsa == NULL) goto bail;
532 */
533 if (!inet_aton(raw, &port_ipv4_sin_addr))
534 goto bail;
535 peer_ipv4_len = sizeof(peer_ipv4);
536 if (getpeername(STDIN_FILENO, &peer_ipv4, &peer_ipv4_len) != 0)
537 goto bail;
538 if (memcmp(&port_ipv4_sin_addr, &peer_ipv4.sin_addr, sizeof(struct in_addr)) != 0)
539 goto bail;
540
541 G.port_addr = xdotted2sockaddr(raw, port);
542 #else
543 G.port_addr = get_peer_lsa(STDIN_FILENO);
544 set_nport(&G.port_addr->u.sa, htons(port));
545 #endif
546 WRITE_OK(FTP_PORTOK);
547 }
548
549 static void
550 handle_rest(void)
551 {
552 /* When ftp_arg == NULL simply restart from beginning */
553 G.restart_pos = G.ftp_arg ? xatoi_positive(G.ftp_arg) : 0;
554 WRITE_OK(FTP_RESTOK);
555 }
556
557 static void
558 handle_retr(void)
559 {
560 struct stat statbuf;
561 off_t bytes_transferred;
562 int remote_fd;
563 int local_file_fd;
564 off_t offset = G.restart_pos;
565 char *response;
566
567 G.restart_pos = 0;
568
569 if (!port_or_pasv_was_seen())
570 return; /* port_or_pasv_was_seen emitted error response */
571
572 /* O_NONBLOCK is useful if file happens to be a device node */
573 local_file_fd = G.ftp_arg ? open(G.ftp_arg, O_RDONLY | O_NONBLOCK) : -1;
574 if (local_file_fd < 0) {
575 WRITE_ERR(FTP_FILEFAIL);
576 return;
577 }
578
579 if (fstat(local_file_fd, &statbuf) != 0 || !S_ISREG(statbuf.st_mode)) {
580 /* Note - pretend open failed */
581 WRITE_ERR(FTP_FILEFAIL);
582 goto file_close_out;
583 }
584 G.local_file_fd = local_file_fd;
585
586 /* Now deactive O_NONBLOCK, otherwise we have a problem
587 * on DMAPI filesystems such as XFS DMAPI.
588 */
589 ndelay_off(local_file_fd);
590
591 /* Set the download offset (from REST) if any */
592 if (offset != 0)
593 xlseek(local_file_fd, offset, SEEK_SET);
594
595 response = xasprintf(
596 " Opening BINARY connection for %s (%"OFF_FMT"u bytes)",
597 G.ftp_arg, statbuf.st_size);
598 remote_fd = get_remote_transfer_fd(response);
599 free(response);
600 if (remote_fd < 0)
601 goto file_close_out;
602
603 bytes_transferred = bb_copyfd_eof(local_file_fd, remote_fd);
604 close(remote_fd);
605 if (bytes_transferred < 0)
606 WRITE_ERR(FTP_BADSENDFILE);
607 else
608 WRITE_OK(FTP_TRANSFEROK);
609
610 file_close_out:
611 close(local_file_fd);
612 G.local_file_fd = 0;
613 }
614
615 /* List commands */
616
617 static int
618 popen_ls(const char *opt)
619 {
620 const char *argv[5];
621 struct fd_pair outfd;
622 pid_t pid;
623
624 argv[0] = "ftpd";
625 argv[1] = opt; /* "-l" or "-1" */
626 #if BB_MMU
627 argv[2] = "--";
628 #else
629 /* NOMMU ftpd ls helper chdirs to argv[2],
630 * preventing peer from seeing real root. */
631 argv[2] = xrealloc_getcwd_or_warn(NULL);
632 #endif
633 argv[3] = G.ftp_arg;
634 argv[4] = NULL;
635
636 /* Improve compatibility with non-RFC conforming FTP clients
637 * which send e.g. "LIST -l", "LIST -la", "LIST -aL".
638 * See https://bugs.kde.org/show_bug.cgi?id=195578 */
639 if (ENABLE_FEATURE_FTPD_ACCEPT_BROKEN_LIST
640 && G.ftp_arg && G.ftp_arg[0] == '-'
641 ) {
642 const char *tmp = strchr(G.ftp_arg, ' ');
643 if (tmp) /* skip the space */
644 tmp++;
645 argv[3] = tmp;
646 }
647
648 xpiped_pair(outfd);
649
650 /*fflush_all(); - so far we dont use stdio on output */
651 pid = BB_MMU ? xfork() : xvfork();
652 if (pid == 0) {
653 /* child */
654 #if !BB_MMU
655 /* On NOMMU, we want to execute a child - copy of ourself.
656 * In chroot we usually can't do it. Thus we chdir
657 * out of the chroot back to original root,
658 * and (see later below) execute bb_busybox_exec_path
659 * relative to current directory */
660 if (fchdir(G.root_fd) != 0)
661 _exit(127);
662 /*close(G.root_fd); - close_on_exec_on() took care of this */
663 #endif
664 /* NB: close _first_, then move fd! */
665 close(outfd.rd);
666 xmove_fd(outfd.wr, STDOUT_FILENO);
667 /* Opening /dev/null in chroot is hard.
668 * Just making sure STDIN_FILENO is opened
669 * to something harmless. Paranoia,
670 * ls won't read it anyway */
671 close(STDIN_FILENO);
672 dup(STDOUT_FILENO); /* copy will become STDIN_FILENO */
673 #if BB_MMU
674 /* memset(&G, 0, sizeof(G)); - ls_main does it */
675 exit(ls_main(ARRAY_SIZE(argv) - 1, (char**) argv));
676 #else
677 /* + 1: we must use relative path here if in chroot.
678 * For example, execv("/proc/self/exe") will fail, since
679 * it looks for "/proc/self/exe" _relative to chroot!_ */
680 execv(bb_busybox_exec_path + 1, (char**) argv);
681 _exit(127);
682 #endif
683 }
684
685 /* parent */
686 close(outfd.wr);
687 #if !BB_MMU
688 free((char*)argv[2]);
689 #endif
690 return outfd.rd;
691 }
692
693 enum {
694 USE_CTRL_CONN = 1,
695 LONG_LISTING = 2,
696 };
697
698 static void
699 handle_dir_common(int opts)
700 {
701 FILE *ls_fp;
702 char *line;
703 int ls_fd;
704
705 if (!(opts & USE_CTRL_CONN) && !port_or_pasv_was_seen())
706 return; /* port_or_pasv_was_seen emitted error response */
707
708 /* -n prevents user/groupname display,
709 * which can be problematic in chroot */
710 ls_fd = popen_ls((opts & LONG_LISTING) ? "-l" : "-1");
711 ls_fp = xfdopen_for_read(ls_fd);
712
713 if (opts & USE_CTRL_CONN) {
714 /* STAT <filename> */
715 cmdio_write_raw(STR(FTP_STATFILE_OK)"-File status:\r\n");
716 while (1) {
717 line = xmalloc_fgetline(ls_fp);
718 if (!line)
719 break;
720 /* Hack: 0 results in no status at all */
721 /* Note: it's ok that we don't prepend space,
722 * ftp.kernel.org doesn't do that too */
723 cmdio_write(0, line);
724 free(line);
725 }
726 WRITE_OK(FTP_STATFILE_OK);
727 } else {
728 /* LIST/NLST [<filename>] */
729 int remote_fd = get_remote_transfer_fd(" Directory listing");
730 if (remote_fd >= 0) {
731 while (1) {
732 line = xmalloc_fgetline(ls_fp);
733 if (!line)
734 break;
735 /* I've seen clients complaining when they
736 * are fed with ls output with bare '\n'.
737 * Pity... that would be much simpler.
738 */
739 /* TODO: need to s/LF/NUL/g here */
740 xwrite_str(remote_fd, line);
741 xwrite(remote_fd, "\r\n", 2);
742 free(line);
743 }
744 }
745 close(remote_fd);
746 WRITE_OK(FTP_TRANSFEROK);
747 }
748 fclose(ls_fp); /* closes ls_fd too */
749 }
750 static void
751 handle_list(void)
752 {
753 handle_dir_common(LONG_LISTING);
754 }
755 static void
756 handle_nlst(void)
757 {
758 /* NLST returns list of names, "\r\n" terminated without regard
759 * to the current binary flag. Names may start with "/",
760 * then they represent full names (we don't produce such names),
761 * otherwise names are relative to current directory.
762 * Embedded "\n" are replaced by NULs. This is safe since names
763 * can never contain NUL.
764 */
765 handle_dir_common(0);
766 }
767 static void
768 handle_stat_file(void)
769 {
770 handle_dir_common(LONG_LISTING + USE_CTRL_CONN);
771 }
772
773 /* This can be extended to handle MLST, as all info is available
774 * in struct stat for that:
775 * MLST file_name
776 * 250-Listing file_name
777 * type=file;size=4161;modify=19970214165800; /dir/dir/file_name
778 * 250 End
779 * Nano-doc:
780 * MLST [<file or dir name, "." assumed if not given>]
781 * Returned name should be either the same as requested, or fully qualified.
782 * If there was no parameter, return "" or (preferred) fully-qualified name.
783 * Returned "facts" (case is not important):
784 * size - size in octets
785 * modify - last modification time
786 * type - entry type (file,dir,OS.unix=block)
787 * (+ cdir and pdir types for MLSD)
788 * unique - unique id of file/directory (inode#)
789 * perm -
790 * a: can be appended to (APPE)
791 * d: can be deleted (RMD/DELE)
792 * f: can be renamed (RNFR)
793 * r: can be read (RETR)
794 * w: can be written (STOR)
795 * e: can CWD into this dir
796 * l: this dir can be listed (dir only!)
797 * c: can create files in this dir
798 * m: can create dirs in this dir (MKD)
799 * p: can delete files in this dir
800 * UNIX.mode - unix file mode
801 */
802 static void
803 handle_size_or_mdtm(int need_size)
804 {
805 struct stat statbuf;
806 struct tm broken_out;
807 char buf[(sizeof("NNN %"OFF_FMT"u\r\n") + sizeof(off_t) * 3)
808 | sizeof("NNN YYYYMMDDhhmmss\r\n")
809 ];
810
811 if (!G.ftp_arg
812 || stat(G.ftp_arg, &statbuf) != 0
813 || !S_ISREG(statbuf.st_mode)
814 ) {
815 WRITE_ERR(FTP_FILEFAIL);
816 return;
817 }
818 if (need_size) {
819 sprintf(buf, STR(FTP_STATFILE_OK)" %"OFF_FMT"u\r\n", statbuf.st_size);
820 } else {
821 gmtime_r(&statbuf.st_mtime, &broken_out);
822 sprintf(buf, STR(FTP_STATFILE_OK)" %04u%02u%02u%02u%02u%02u\r\n",
823 broken_out.tm_year + 1900,
824 broken_out.tm_mon,
825 broken_out.tm_mday,
826 broken_out.tm_hour,
827 broken_out.tm_min,
828 broken_out.tm_sec);
829 }
830 cmdio_write_raw(buf);
831 }
832
833 /* Upload commands */
834
835 #if ENABLE_FEATURE_FTP_WRITE
836 static void
837 handle_mkd(void)
838 {
839 if (!G.ftp_arg || mkdir(G.ftp_arg, 0777) != 0) {
840 WRITE_ERR(FTP_FILEFAIL);
841 return;
842 }
843 WRITE_OK(FTP_MKDIROK);
844 }
845
846 static void
847 handle_rmd(void)
848 {
849 if (!G.ftp_arg || rmdir(G.ftp_arg) != 0) {
850 WRITE_ERR(FTP_FILEFAIL);
851 return;
852 }
853 WRITE_OK(FTP_RMDIROK);
854 }
855
856 static void
857 handle_dele(void)
858 {
859 if (!G.ftp_arg || unlink(G.ftp_arg) != 0) {
860 WRITE_ERR(FTP_FILEFAIL);
861 return;
862 }
863 WRITE_OK(FTP_DELEOK);
864 }
865
866 static void
867 handle_rnfr(void)
868 {
869 free(G.rnfr_filename);
870 G.rnfr_filename = xstrdup(G.ftp_arg);
871 WRITE_OK(FTP_RNFROK);
872 }
873
874 static void
875 handle_rnto(void)
876 {
877 int retval;
878
879 /* If we didn't get a RNFR, throw a wobbly */
880 if (G.rnfr_filename == NULL || G.ftp_arg == NULL) {
881 cmdio_write_raw(STR(FTP_NEEDRNFR)" Use RNFR first\r\n");
882 return;
883 }
884
885 retval = rename(G.rnfr_filename, G.ftp_arg);
886 free(G.rnfr_filename);
887 G.rnfr_filename = NULL;
888
889 if (retval) {
890 WRITE_ERR(FTP_FILEFAIL);
891 return;
892 }
893 WRITE_OK(FTP_RENAMEOK);
894 }
895
896 static void
897 handle_upload_common(int is_append, int is_unique)
898 {
899 struct stat statbuf;
900 char *tempname;
901 off_t bytes_transferred;
902 off_t offset;
903 int local_file_fd;
904 int remote_fd;
905
906 offset = G.restart_pos;
907 G.restart_pos = 0;
908
909 if (!port_or_pasv_was_seen())
910 return; /* port_or_pasv_was_seen emitted error response */
911
912 tempname = NULL;
913 local_file_fd = -1;
914 if (is_unique) {
915 tempname = xstrdup(" FILE: uniq.XXXXXX");
916 local_file_fd = mkstemp(tempname + 7);
917 } else if (G.ftp_arg) {
918 int flags = O_WRONLY | O_CREAT | O_TRUNC;
919 if (is_append)
920 flags = O_WRONLY | O_CREAT | O_APPEND;
921 if (offset)
922 flags = O_WRONLY | O_CREAT;
923 local_file_fd = open(G.ftp_arg, flags, 0666);
924 }
925
926 if (local_file_fd < 0
927 || fstat(local_file_fd, &statbuf) != 0
928 || !S_ISREG(statbuf.st_mode)
929 ) {
930 WRITE_ERR(FTP_UPLOADFAIL);
931 if (local_file_fd >= 0)
932 goto close_local_and_bail;
933 return;
934 }
935 G.local_file_fd = local_file_fd;
936
937 if (offset)
938 xlseek(local_file_fd, offset, SEEK_SET);
939
940 remote_fd = get_remote_transfer_fd(tempname ? tempname : " Ok to send data");
941 free(tempname);
942
943 if (remote_fd < 0)
944 goto close_local_and_bail;
945
946 bytes_transferred = bb_copyfd_eof(remote_fd, local_file_fd);
947 close(remote_fd);
948 if (bytes_transferred < 0)
949 WRITE_ERR(FTP_BADSENDFILE);
950 else
951 WRITE_OK(FTP_TRANSFEROK);
952
953 close_local_and_bail:
954 close(local_file_fd);
955 G.local_file_fd = 0;
956 }
957
958 static void
959 handle_stor(void)
960 {
961 handle_upload_common(0, 0);
962 }
963
964 static void
965 handle_appe(void)
966 {
967 G.restart_pos = 0;
968 handle_upload_common(1, 0);
969 }
970
971 static void
972 handle_stou(void)
973 {
974 G.restart_pos = 0;
975 handle_upload_common(0, 1);
976 }
977 #endif /* ENABLE_FEATURE_FTP_WRITE */
978
979 static uint32_t
980 cmdio_get_cmd_and_arg(void)
981 {
982 int len;
983 uint32_t cmdval;
984 char *cmd;
985
986 alarm(G.timeout);
987
988 free(G.ftp_cmd);
989 {
990 /* Paranoia. Peer may send 1 gigabyte long cmd... */
991 /* Using separate len_on_stk instead of len optimizes
992 * code size (allows len to be in CPU register) */
993 size_t len_on_stk = 8 * 1024;
994 G.ftp_cmd = cmd = xmalloc_fgets_str_len(stdin, "\r\n", &len_on_stk);
995 if (!cmd)
996 exit(0);
997 len = len_on_stk;
998 }
999
1000 /* De-escape telnet: 0xff,0xff => 0xff */
1001 /* RFC959 says that ABOR, STAT, QUIT may be sent even during
1002 * data transfer, and may be preceded by telnet's "Interrupt Process"
1003 * code (two-byte sequence 255,244) and then by telnet "Synch" code
1004 * 255,242 (byte 242 is sent with TCP URG bit using send(MSG_OOB)
1005 * and may generate SIGURG on our side. See RFC854).
1006 * So far we don't support that (may install SIGURG handler if we'd want to),
1007 * but we need to at least remove 255,xxx pairs. lftp sends those. */
1008 /* Then de-escape FTP: NUL => '\n' */
1009 /* Testing for \xff:
1010 * Create file named '\xff': echo Hello >`echo -ne "\xff"`
1011 * Try to get it: ftpget -v 127.0.0.1 Eff `echo -ne "\xff\xff"`
1012 * (need "\xff\xff" until ftpget applet is fixed to do escaping :)
1013 * Testing for embedded LF:
1014 * LF_HERE=`echo -ne "LF\nHERE"`
1015 * echo Hello >"$LF_HERE"
1016 * ftpget -v 127.0.0.1 LF_HERE "$LF_HERE"
1017 */
1018 {
1019 int dst, src;
1020
1021 /* Strip "\r\n" if it is there */
1022 if (len != 0 && cmd[len - 1] == '\n') {
1023 len--;
1024 if (len != 0 && cmd[len - 1] == '\r')
1025 len--;
1026 cmd[len] = '\0';
1027 }
1028 src = strchrnul(cmd, 0xff) - cmd;
1029 /* 99,99% there are neither NULs nor 255s and src == len */
1030 if (src < len) {
1031 dst = src;
1032 do {
1033 if ((unsigned char)(cmd[src]) == 255) {
1034 src++;
1035 /* 255,xxx - skip 255 */
1036 if ((unsigned char)(cmd[src]) != 255) {
1037 /* 255,!255 - skip both */
1038 src++;
1039 continue;
1040 }
1041 /* 255,255 - retain one 255 */
1042 }
1043 /* NUL => '\n' */
1044 cmd[dst++] = cmd[src] ? cmd[src] : '\n';
1045 src++;
1046 } while (src < len);
1047 cmd[dst] = '\0';
1048 }
1049 }
1050
1051 if (G.verbose > 1)
1052 verbose_log(cmd);
1053
1054 G.ftp_arg = strchr(cmd, ' ');
1055 if (G.ftp_arg != NULL)
1056 *G.ftp_arg++ = '\0';
1057
1058 /* Uppercase and pack into uint32_t first word of the command */
1059 cmdval = 0;
1060 while (*cmd)
1061 cmdval = (cmdval << 8) + ((unsigned char)*cmd++ & (unsigned char)~0x20);
1062
1063 return cmdval;
1064 }
1065
1066 #define mk_const4(a,b,c,d) (((a * 0x100 + b) * 0x100 + c) * 0x100 + d)
1067 #define mk_const3(a,b,c) ((a * 0x100 + b) * 0x100 + c)
1068 enum {
1069 const_ALLO = mk_const4('A', 'L', 'L', 'O'),
1070 const_APPE = mk_const4('A', 'P', 'P', 'E'),
1071 const_CDUP = mk_const4('C', 'D', 'U', 'P'),
1072 const_CWD = mk_const3('C', 'W', 'D'),
1073 const_DELE = mk_const4('D', 'E', 'L', 'E'),
1074 const_EPSV = mk_const4('E', 'P', 'S', 'V'),
1075 const_FEAT = mk_const4('F', 'E', 'A', 'T'),
1076 const_HELP = mk_const4('H', 'E', 'L', 'P'),
1077 const_LIST = mk_const4('L', 'I', 'S', 'T'),
1078 const_MDTM = mk_const4('M', 'D', 'T', 'M'),
1079 const_MKD = mk_const3('M', 'K', 'D'),
1080 const_MODE = mk_const4('M', 'O', 'D', 'E'),
1081 const_NLST = mk_const4('N', 'L', 'S', 'T'),
1082 const_NOOP = mk_const4('N', 'O', 'O', 'P'),
1083 const_PASS = mk_const4('P', 'A', 'S', 'S'),
1084 const_PASV = mk_const4('P', 'A', 'S', 'V'),
1085 const_PORT = mk_const4('P', 'O', 'R', 'T'),
1086 const_PWD = mk_const3('P', 'W', 'D'),
1087 const_QUIT = mk_const4('Q', 'U', 'I', 'T'),
1088 const_REST = mk_const4('R', 'E', 'S', 'T'),
1089 const_RETR = mk_const4('R', 'E', 'T', 'R'),
1090 const_RMD = mk_const3('R', 'M', 'D'),
1091 const_RNFR = mk_const4('R', 'N', 'F', 'R'),
1092 const_RNTO = mk_const4('R', 'N', 'T', 'O'),
1093 const_SIZE = mk_const4('S', 'I', 'Z', 'E'),
1094 const_STAT = mk_const4('S', 'T', 'A', 'T'),
1095 const_STOR = mk_const4('S', 'T', 'O', 'R'),
1096 const_STOU = mk_const4('S', 'T', 'O', 'U'),
1097 const_STRU = mk_const4('S', 'T', 'R', 'U'),
1098 const_SYST = mk_const4('S', 'Y', 'S', 'T'),
1099 const_TYPE = mk_const4('T', 'Y', 'P', 'E'),
1100 const_USER = mk_const4('U', 'S', 'E', 'R'),
1101
1102 #if !BB_MMU
1103 OPT_l = (1 << 0),
1104 OPT_1 = (1 << 1),
1105 #endif
1106 OPT_v = (1 << ((!BB_MMU) * 2 + 0)),
1107 OPT_S = (1 << ((!BB_MMU) * 2 + 1)),
1108 OPT_w = (1 << ((!BB_MMU) * 2 + 2)) * ENABLE_FEATURE_FTP_WRITE,
1109 };
1110
1111 int ftpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1112 #if !BB_MMU
1113 int ftpd_main(int argc, char **argv)
1114 #else
1115 int ftpd_main(int argc UNUSED_PARAM, char **argv)
1116 #endif
1117 {
1118 unsigned abs_timeout;
1119 unsigned verbose_S;
1120 smallint opts;
1121
1122 INIT_G();
1123
1124 abs_timeout = 1 * 60 * 60;
1125 verbose_S = 0;
1126 G.timeout = 2 * 60;
1127 opt_complementary = "t+:T+:vv:SS";
1128 #if BB_MMU
1129 opts = getopt32(argv, "vS" IF_FEATURE_FTP_WRITE("w") "t:T:", &G.timeout, &abs_timeout, &G.verbose, &verbose_S);
1130 #else
1131 opts = getopt32(argv, "l1vS" IF_FEATURE_FTP_WRITE("w") "t:T:", &G.timeout, &abs_timeout, &G.verbose, &verbose_S);
1132 if (opts & (OPT_l|OPT_1)) {
1133 /* Our secret backdoor to ls */
1134 /* TODO: pass -n? It prevents user/group resolution, which may not work in chroot anyway */
1135 /* TODO: pass -A? It shows dot files */
1136 /* TODO: pass --group-directories-first? would be nice, but ls doesn't do that yet */
1137 xchdir(argv[2]);
1138 argv[2] = (char*)"--";
1139 /* memset(&G, 0, sizeof(G)); - ls_main does it */
1140 return ls_main(argc, argv);
1141 }
1142 #endif
1143 if (G.verbose < verbose_S)
1144 G.verbose = verbose_S;
1145 if (abs_timeout | G.timeout) {
1146 if (abs_timeout == 0)
1147 abs_timeout = INT_MAX;
1148 G.end_time = monotonic_sec() + abs_timeout;
1149 if (G.timeout > abs_timeout)
1150 G.timeout = abs_timeout;
1151 }
1152 strcpy(G.msg_ok + 4, MSG_OK );
1153 strcpy(G.msg_err + 4, MSG_ERR);
1154
1155 G.local_addr = get_sock_lsa(STDIN_FILENO);
1156 if (!G.local_addr) {
1157 /* This is confusing:
1158 * bb_error_msg_and_die("stdin is not a socket");
1159 * Better: */
1160 bb_show_usage();
1161 /* Help text says that ftpd must be used as inetd service,
1162 * which is by far the most usual cause of get_sock_lsa
1163 * failure */
1164 }
1165
1166 if (!(opts & OPT_v))
1167 logmode = LOGMODE_NONE;
1168 if (opts & OPT_S) {
1169 /* LOG_NDELAY is needed since we may chroot later */
1170 openlog(applet_name, LOG_PID | LOG_NDELAY, LOG_DAEMON);
1171 logmode |= LOGMODE_SYSLOG;
1172 }
1173 if (logmode)
1174 applet_name = xasprintf("%s[%u]", applet_name, (int)getpid());
1175
1176 #if !BB_MMU
1177 G.root_fd = xopen("/", O_RDONLY | O_DIRECTORY);
1178 close_on_exec_on(G.root_fd);
1179 #endif
1180
1181 if (argv[optind]) {
1182 xchroot(argv[optind]);
1183 }
1184
1185 //umask(077); - admin can set umask before starting us
1186
1187 /* Signals. We'll always take -EPIPE rather than a rude signal, thanks */
1188 signal(SIGPIPE, SIG_IGN);
1189
1190 /* Set up options on the command socket (do we need these all? why?) */
1191 setsockopt(STDIN_FILENO, IPPROTO_TCP, TCP_NODELAY, &const_int_1, sizeof(const_int_1));
1192 setsockopt(STDIN_FILENO, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
1193 /* Telnet protocol over command link may send "urgent" data,
1194 * we prefer it to be received in the "normal" data stream: */
1195 setsockopt(STDIN_FILENO, SOL_SOCKET, SO_OOBINLINE, &const_int_1, sizeof(const_int_1));
1196
1197 WRITE_OK(FTP_GREET);
1198 signal(SIGALRM, timeout_handler);
1199
1200 #ifdef IF_WE_WANT_TO_REQUIRE_LOGIN
1201 {
1202 smallint user_was_specified = 0;
1203 while (1) {
1204 uint32_t cmdval = cmdio_get_cmd_and_arg();
1205
1206 if (cmdval == const_USER) {
1207 if (G.ftp_arg == NULL || strcasecmp(G.ftp_arg, "anonymous") != 0)
1208 cmdio_write_raw(STR(FTP_LOGINERR)" Server is anonymous only\r\n");
1209 else {
1210 user_was_specified = 1;
1211 cmdio_write_raw(STR(FTP_GIVEPWORD)" Please specify the password\r\n");
1212 }
1213 } else if (cmdval == const_PASS) {
1214 if (user_was_specified)
1215 break;
1216 cmdio_write_raw(STR(FTP_NEEDUSER)" Login with USER\r\n");
1217 } else if (cmdval == const_QUIT) {
1218 WRITE_OK(FTP_GOODBYE);
1219 return 0;
1220 } else {
1221 cmdio_write_raw(STR(FTP_LOGINERR)" Login with USER and PASS\r\n");
1222 }
1223 }
1224 }
1225 WRITE_OK(FTP_LOGINOK);
1226 #endif
1227
1228 /* RFC-959 Section 5.1
1229 * The following commands and options MUST be supported by every
1230 * server-FTP and user-FTP, except in cases where the underlying
1231 * file system or operating system does not allow or support
1232 * a particular command.
1233 * Type: ASCII Non-print, IMAGE, LOCAL 8
1234 * Mode: Stream
1235 * Structure: File, Record*
1236 * (Record structure is REQUIRED only for hosts whose file
1237 * systems support record structure).
1238 * Commands:
1239 * USER, PASS, ACCT, [bbox: ACCT not supported]
1240 * PORT, PASV,
1241 * TYPE, MODE, STRU,
1242 * RETR, STOR, APPE,
1243 * RNFR, RNTO, DELE,
1244 * CWD, CDUP, RMD, MKD, PWD,
1245 * LIST, NLST,
1246 * SYST, STAT,
1247 * HELP, NOOP, QUIT.
1248 */
1249 /* ACCOUNT (ACCT)
1250 * "The argument field is a Telnet string identifying the user's account.
1251 * The command is not necessarily related to the USER command, as some
1252 * sites may require an account for login and others only for specific
1253 * access, such as storing files. In the latter case the command may
1254 * arrive at any time.
1255 * There are reply codes to differentiate these cases for the automation:
1256 * when account information is required for login, the response to
1257 * a successful PASSword command is reply code 332. On the other hand,
1258 * if account information is NOT required for login, the reply to
1259 * a successful PASSword command is 230; and if the account information
1260 * is needed for a command issued later in the dialogue, the server
1261 * should return a 332 or 532 reply depending on whether it stores
1262 * (pending receipt of the ACCounT command) or discards the command,
1263 * respectively."
1264 */
1265
1266 while (1) {
1267 uint32_t cmdval = cmdio_get_cmd_and_arg();
1268
1269 if (cmdval == const_QUIT) {
1270 WRITE_OK(FTP_GOODBYE);
1271 return 0;
1272 }
1273 else if (cmdval == const_USER)
1274 /* This would mean "ok, now give me PASS". */
1275 /*WRITE_OK(FTP_GIVEPWORD);*/
1276 /* vsftpd can be configured to not require that,
1277 * and this also saves one roundtrip:
1278 */
1279 WRITE_OK(FTP_LOGINOK);
1280 else if (cmdval == const_PASS)
1281 WRITE_OK(FTP_LOGINOK);
1282 else if (cmdval == const_NOOP)
1283 WRITE_OK(FTP_NOOPOK);
1284 else if (cmdval == const_TYPE)
1285 WRITE_OK(FTP_TYPEOK);
1286 else if (cmdval == const_STRU)
1287 WRITE_OK(FTP_STRUOK);
1288 else if (cmdval == const_MODE)
1289 WRITE_OK(FTP_MODEOK);
1290 else if (cmdval == const_ALLO)
1291 WRITE_OK(FTP_ALLOOK);
1292 else if (cmdval == const_SYST)
1293 cmdio_write_raw(STR(FTP_SYSTOK)" UNIX Type: L8\r\n");
1294 else if (cmdval == const_PWD)
1295 handle_pwd();
1296 else if (cmdval == const_CWD)
1297 handle_cwd();
1298 else if (cmdval == const_CDUP) /* cd .. */
1299 handle_cdup();
1300 /* HELP is nearly useless, but we can reuse FEAT for it */
1301 /* lftp uses FEAT */
1302 else if (cmdval == const_HELP || cmdval == const_FEAT)
1303 handle_feat(cmdval == const_HELP
1304 ? STRNUM32(FTP_HELP)
1305 : STRNUM32(FTP_STATOK)
1306 );
1307 else if (cmdval == const_LIST) /* ls -l */
1308 handle_list();
1309 else if (cmdval == const_NLST) /* "name list", bare ls */
1310 handle_nlst();
1311 /* SIZE is crucial for wget's download indicator etc */
1312 /* Mozilla, lftp use MDTM (presumably for caching) */
1313 else if (cmdval == const_SIZE || cmdval == const_MDTM)
1314 handle_size_or_mdtm(cmdval == const_SIZE);
1315 else if (cmdval == const_STAT) {
1316 if (G.ftp_arg == NULL)
1317 handle_stat();
1318 else
1319 handle_stat_file();
1320 }
1321 else if (cmdval == const_PASV)
1322 handle_pasv();
1323 else if (cmdval == const_EPSV)
1324 handle_epsv();
1325 else if (cmdval == const_RETR)
1326 handle_retr();
1327 else if (cmdval == const_PORT)
1328 handle_port();
1329 else if (cmdval == const_REST)
1330 handle_rest();
1331 #if ENABLE_FEATURE_FTP_WRITE
1332 else if (opts & OPT_w) {
1333 if (cmdval == const_STOR)
1334 handle_stor();
1335 else if (cmdval == const_MKD)
1336 handle_mkd();
1337 else if (cmdval == const_RMD)
1338 handle_rmd();
1339 else if (cmdval == const_DELE)
1340 handle_dele();
1341 else if (cmdval == const_RNFR) /* "rename from" */
1342 handle_rnfr();
1343 else if (cmdval == const_RNTO) /* "rename to" */
1344 handle_rnto();
1345 else if (cmdval == const_APPE)
1346 handle_appe();
1347 else if (cmdval == const_STOU) /* "store unique" */
1348 handle_stou();
1349 else
1350 goto bad_cmd;
1351 }
1352 #endif
1353 #if 0
1354 else if (cmdval == const_STOR
1355 || cmdval == const_MKD
1356 || cmdval == const_RMD
1357 || cmdval == const_DELE
1358 || cmdval == const_RNFR
1359 || cmdval == const_RNTO
1360 || cmdval == const_APPE
1361 || cmdval == const_STOU
1362 ) {
1363 cmdio_write_raw(STR(FTP_NOPERM)" Permission denied\r\n");
1364 }
1365 #endif
1366 else {
1367 /* Which unsupported commands were seen in the wild?
1368 * (doesn't necessarily mean "we must support them")
1369 * foo 1.2.3: XXXX - comment
1370 */
1371 #if ENABLE_FEATURE_FTP_WRITE
1372 bad_cmd:
1373 #endif
1374 cmdio_write_raw(STR(FTP_BADCMD)" Unknown command\r\n");
1375 }
1376 }
1377 }
Tomato firmware and modifications.